Infrared are the radiations that contain heat. Absorbing them will make atmosphere warmer.
Infrared Waves
photosynthesis
The warm water currents in the ocean make the atmosphere warmer hence the climate of those regions become warmer.
If the air in the in the upper atmosphere were warmer than the water vapor that was continued in the air would make the earth colder in the air.
It is very unlikely for infrared radiation to have a dangerous effect on people. Normally, it will just make a person feel warmer. High levels can lead to burns and very rarely, cataracts in the eyes.
It will make the air humid, and so you may feel warmer.
Air currents affect heat by absorbing the particles which causes the particles to expand to make it even hotter.
Infrared rays are heat emitted by any hot object.They can keep your dinner warm.They can heat your home.They do send heat that causes the greenhouse effect.
They're ... radiated. Outward. Some of them get absorbed by stuff (trees, buildings, clouds, the atmosphere itself), some of them get reflected by stuff (trees, buildings, clouds, the atmosphere itself), some of them get scattered by stuff (you know the drill), some of them make it out of the atmosphere.
Thunderstorms are drieven by a conditions ccalled instability which, in basic terms, occurs when the lower atmosphere becomes warmer while the upper atmosphere remains cooler. At night the lower atmosphere cools as heat is radiated into space, which tends to stabilize the atmosphere, and make it harder for thunderstorms to form.
Well, atmospheres help absorb heat, so it traps in heat from the sun to make it warmer, so the absence of an atmosphere on the moon affects it by making it cooler because without an atmosphere, there is no way to trap in and keep heat.
Water vapor is the gas state of water, and contributes to humidity in the atmosphere. Water vapor absorbs heat and can make the air feel warmer than it really is.